Import updated test_secrets.sh
    
    Imports the latest version of the script from
    gitlab.suse.de:OPS-Service/salt.git.
    
    Notable improvements are the support for both yaml|gpg and gpg|yaml as
    well as "empty" headers.
    
    Signed-off-by: Georg Pfuetzenreuter <georg.pfuetzenreuter@suse.com>